Magnetic recording apparatus



p 1952 H. H. DAVIS 2,610,808

MAGNETIC RECORDING APPARATUS Filed Nov. 22, 1946 6 Sheets-Sheet 1 INVEN TOR. J/y/z J. Dal/2's ATTORNEY Sept. 16, 1952 H. H. DAVIS 2,610,308

MAGNETIC RECORDING APPARATUS 7 Filed Nov. 22, 1946 6 Sheets-Sheet 2 IN V EN TOR.

ATTORNEY p 1952 H. H. DAVIS 2,610,808

MAGNETIC RECORDING APPARATUS Filed Nov. 22, 1946 6 Sheets-Sheet 3 IN VEN TOR.

S a /Z 2/. 27am ATTORNEY Sept. 16, 1952 H. H. DAVIS MAGNETIC RECORDING APPARATUS 6 Sheets-Sheet 4 Filed Nov. 22, 1946 INVENTOR;

jfijfi 2 6 Fans XZ/MQ W ATTORNEY Sept. 16, 1952 H. H. DAVIS MAGNETIC RECORDING APPARATUS 6 Sheets-Sheet 5 Filed NOV. 22, 1946 JNVENTOR.

2 /1912 3/. Dams BY f 5: k ATTORNEY P 16, 1952 H. H. DAVIS 2,610,808

MAGNETIC RECORDING APPARATUS Filed Nov. 22, 1946 (:3 Sheets-Sheet 6 [WEI/mg Z7 gag; flqrgn 2770mm Patented Sept. 16, 1952 MAGNETIC RECORDING APPARATUS Hugh Iii-Davis,- Chicago, Ill.,; assignor to .l. P. Seeburg CorporationnGhieago, Ill., a corpora- I tionof Illinois;

Application November 22, 1946,- SerialNo. 711,543

mour (cram-54) This invention relates to magnetic recording apparatus intended. for making:- orreproducing recordings or both, on. a movable magnetic me-- dium. Such a machine may be reierred to gen:- erally as a windandrewindmachine;

Generally the machine comprises means tor drivingv a takeup reel. to; take up. the mediumdur mg; play or recording and. for driving a: supply reel torewind the medium back on v the supply reel. which oscillates to distribute; thexmagrietic medium, preferably: wire; evenly over: the": receiving reel. My machine comprises: manually actu'able stop means and automatic: meanstorstopping' the machine when: nearly all. the 'medlum' has been transferred to the receiving: reel; I provide brakes to arrest the two momma themachine to the: reels. the: arrangement: being slichthat when" one reel is thus: connected the' other is disconnected a-nd vice versa.

When: the machine isstopped either manually or automatically when thewire is depleted from the supplying reel both: idlersare disconnected from the: reels and from the motor; I interconnect the control mechanism: with the brak'es'so that when the machine is' stopped; the supplying reel. is more strongly braked than the receiving reel in such manner that thewire remains taut as the movin elements: coast to a stop-.- 1

In case" the machine-stops owing. totail'ore of the power supply the motor remainsc'onnected tothe receiving! reelqso that' 'tlie energy of the receiving system tends to: keep-the wire taut.-

ZE prefer to employ a takeup' reel; which is'r'x'iuch larger than. the supply reel.v owing to the large inertia of this: large reel, particularly" when it is well loaded with wire, there isa dangerthot the wire between. the reels might become loose: when the power: fails during rewind: To obviate this danger I prefer" to provide: to apply the brakes when the power failsi during rewind; ow ing to: the (inferential braking eilec't previously referred to the large takeup reel is more. strongly braked: so that the wire is maintained. taut nov matter how the machine isstopp'ed. The automatic stopping of: the machine is e1 fe'cted: by means on elements: associated with: the

reels so as to cooperate with the wire: on the supplying; reel. In oneform .whiciiiispaizticularly and means associated with this member uniotch the" control element; In the-case of the Between the two reels is located a head i 2 takeup' reel I prefer to employ two plungers which are arranged to project outwardly into the wire space on the takeup reel. When wire is taken up by the takeup reel the plunger's are moved inwardly. These plungersare located inspaced relation in the axial direction of the 'takeup reel. During rewind' the wire clears one of the plunge'rs and means associated with the plunger releases the control member so that the machine is brought to a stop. Since there are several convolu-tions t wire'between'the two plungers the machine is stopped before all the wire isremoved from the takeup'reel near'the end of the-rewind operation.

The control member maysuitably be a rotatable member biass'ed towards neutral or off position. When the control member is moved in onedlrection itcloses the motor switch, connects,

the drive of the motor to the takeup reel and conditions the brakes so that the supply reel will bez more strongly braked when themachine is stopped; mienthe control member is moved in the opposite direction from ofi position it closes the motor switch, connects the drive of themotor to the supply reel and conditions the brakes so that the takeup reel ismore strongly braked when sections;

the machine is stopped. The control member is latched in both of the on positions and the machine i's stopped automatically by releasing the restraining latch. The latches may also be released manually by a button provided for that purpose. I The invention will more readily be" understood from the following description of a preferred embodiment thereof, taken in conjunction with accompanyin drawings, in which:

Figure li's a -p1an-view of a windand rewind machine; parts being broken away to disclose mechanismsfn wind condition; I

Fig. 2 is a fragmentary sectional elevation showing the driveofthe large reel Fig.'-' 3 is a fragmentary planyiew similar to Fig. 1 with more portions broken away todisclose lower mechanisms, the section being generallyon the'line' 3-3 ofFig. 4,- I

Fig. 4' is a" fragmentary sectional elevation showing the supply reel and associated parts in Fig. 5 is a frgamentary plan View showing the brakes and associated elements; I

Fig. 6 is a fragmentary sectional plan View takenin the line" 6-.8 of Fig 4 showingthe switch and associated element's;

'T is aplaztv iew similar to- Fig. 3 showing the elements in rewind condition; I

: Fig; 8 is a fragmentary elevational-se'ction showing part of the large reel and associated mechanism which is actuated at the end of the rewind operation;

Fig. 9 is an elevational view of the control mechanism in rewind position;

Fig. 10 is a fragmentary plan view similar to Fig. 7, the takeup reel and most of the base plate being omitted to illustrate mechanisms therebeneath, which elements are shown in rewind condition;

Fig. 11 is a sectional plan detail view similar to Fig. 6 and taken on the line ||-Il of Fig. 9 showing the switch and associated elements in rewind condition;

Fig. 12 is a sectional plan detail view showing part of the control element in rewind condition, the section being taken in the line l2-I2 of Fig. 9;

Fig. 13 is a fragmentary sectional plan showing the manner in which the brakes are applied and the drive of the takeup reel is disconnected at the end of a wind operation;

Fig. 14 is a. fragmentary elevational view showing the supply reel and associated parts in section, the elements being shown in condition to stop the machine at the end of the wind operation;

Fig. 15 is a sectional plan detail view taken on the line l5| 5 of Fig. 14 showing the manner in which the lever I30 is conditioned more effectively to brake the supply reel at the end of the wind operation;

Fig. 16 is a fragmentary plan view similar to Fig. 13 showing the manner in which the brakes are applied and the drive of the supply reel is disconnected at the end of the rewind operation;

Fig. 17 is a fragmentary sectional elevational view showing the manner in which the machine is stopped at the end of the rewind operation;

Fig. 18 is a fragmentary sectional plan view taken on the line [8-[8 of Fig. 17 similar to Fig. 15 showing the manner in which the lever I30 is conditioned more strongly to brake the takeup reel at the end of the rewind operation;

Fig. 19 is a sectional detail plan view taken on the line |9l9 of Fig. 14 or Fig. 17 showing the manner in which the switch is opened at the end of either the wind or rewind operation;

Fig. 20 is a, vertical section through the control element showing the manner in which the control element is maintained in wind condition;

Fig. 21 is a similar view showing the manner in which the control element is released from this condition by depression of the Stop button 36;

Fig. 22 is a fragmentary sectional plan view showing the permanent brakes which apply braking forces to both reels; I

Fig. 23 is a fragmentary plan view of the control member, parts being broken away to show concealed elements;

Fig. 24 is a fragmentary sectional elevation showing control mechanism associated with the takeup reel for effecting normal stopping of the machine when the power fails;

Fig. 25 is a sectional elevation of the takeup reel showing the manner in which the supply reel may be mounted thereon;

Fig. 26 is a fragmentary plan view of the reels as shown in Fig. 25;

Fig. 27 is a perspective view of the supply reel;

Fig. 28 is a fragmentary elevational view of the takeup reel showing the manner in which the medium is brought to the upper side of the reel for mounting the supply reel thereon shown in Figs. 25 and 26;

Fig. 29 is a sectional elevation of the terminal clip for the medium;

Fig. 30 is a sectional elevational view of the head and associated mechanism;

Figf31 is a wiring diagram;

Fig. 32 is a sectional elevation of the supply reel and a modified form of the mounting thereof in which the stopping mechanism is balanced centrifugally;

Fig. 33 is a sectional plan view of the takeup reel showing modified means for stopping the machine at the end of the rewind operation, which are balanced centrifugally Fig. 34'is a view similar to Fig. 33 showing a modified form of centrifugally balanced means for stopping the machine; and

Fig. 35 is still another similar view showing a still further modified centrifugally balanced means for stopping the machine. 3 Referring to the drawings the mechanism is carried by a base 30 (Fig. 1) adapted for mounting in the cabinet of a radio receiver, for example. During the reproduction or recording the takeup reel 3| is driven so as to take up the magnetic recording medium, which may be a wire 33 from the supply reel 32, the medium passing through the head 34. The head 34 is oscillated upwardly and downwardly to serve as a level wind distributing the wire evenly over the reel which is receiving it. The machine is put into operation by a manual control 35 which is turned to the play position for recording or play-back. When almost all of the wire has been transferred from the supply reel 32 to the takeup reel 3| the motor stops. The motor may be stopped at any time by depressing a. button 36. The manual control 35 may now be turned to rewind position Whereupon the supply reel 32 is driven in the opposite direction to transfer substantially all of the wire to the supply reel and when only a few convolutions of Wire remain on the takeup reel 3| the motor again stops as will hereinafter be explained. Stoppage of the motor is accompanied by the application of brakes to various parts of the mechanism to prevent snarling or breaking of the wire due to inertia of moving elements.

The takeup reel 3| is relatively large and the wire is accommodated in the form of a coil of relatively large diameter so that the progressive building up of the wire on the takeup reel has very little effect on the wire speed. The takeup reel3l may be usedas a permanent part of the machine. The supply reel 32 is of relatively small diameter for ease of storage of a large number of such reels. This reel is readily removable so that the machine may readily play any of a large number of storage reels.

The recording head 34 includes a combined recording and play-back electromagnet 31 and an eraser electromagnet 38 which is located nearer the supply reel 32 than is the electromagnet 31. The head 34 is provided with an outwardly directed slot or recess 39 which receives the wire bringing it into engagement with both electromagnets 31 and 38 in known manner. The present invention is not concerned with the known manner in which the magnets 31 and 38 operate. It is suflicient to state that when the machine is used as a play-back unit the magnet 31 picks up a signal from the wire, which signal is converted into audible sound in known manner. When the machine is used as a recorder signal is supplied to the magnet 31 in known manner to apply recorded signal on to the wire. The eraser magnet 38 is energized in known manner when it is desired to remove signal from the wire.

Pre erably the eraser magnet 38 is energized .5 during recording so: that the signal may beerased from the wire and a. new signal may be applied thereto at the same time. Themechanism is preferably provided with a lamp 40 which is iiluminated when the eraser magnet 38,15. energized. This lamp .may suitably illuminate a window 41 which bearsindicia suchv asv the word recording in order to prevent the operator from accidentally erasing signal which he doesnot' desirev to have erased.

Thetakeup reel 3i isgenerally in the. form of an inverted'dish as is bestshown in Fig. '25.. The depending skirt 4.2 is provided with a peripheral recess 43in which the wire is received. The. lower portion of the skirt serves as a true. driving surface which is engaged by the rubber tired idler 44' shown in Figs..l,. 2 and 3.. The central portion of "the reel 3-1 is dished downwardly as shown in Fig. 25 and it is. provided with a hub 45. When the reel 34 ismounted on the machine as shown in- Fig- 24 the central Opening: of the hub 45 receives the upper end of a vertical spin.- dle 46- and the lower surface. of the hub. rests on a collar 4 7 on this spindle. The collar: carries twodowel pins which. extend into corresponding openings in thevhub45. The reel 31 is: firmly secured to thespindle. 46. by means of. a convex disc 48 which is secured to the spindle 46 by means of a-screw 49 which engages a threaded hole in the upper end or" the spindle. The

disc 48 is provided with finger openings so that it i may be unscrewed to effect removal of the reel 3|. The spindle 46 is mounted for free rotation by means of bearings 50 and 51 and it carries a pulley 52. 5

On the under side of the reel-3| are mounted two plungers 53 which are biased radially outward by Weak springs 54 into the wire receiving recess 43'. The plungers 53' carry actuating members 55 which have the effect of stopping the motor and applying the brakes when only a few convolutions of wire remain on the reel 31-. One of the plungers53 is located at a high point ofthe recess 43 and the other is located at alowpoint on this recess. When the wire is being taken up by the reel 34 the head distributes the first layerof wire uponthe bottom of the recess 43 and the two plungers 53 are moved inwardly-by the wire. During the rewind operaticnone of the plungers 53 is disengaged from the wire. first and the machine in stopped before the convolutions of J the wire betweenthe two plungers 53 are removed from the reel 3 i The supply reel 32 (Fig, 27) may s1'1itablycomprise a cylindrical wall 56 and top and bottom flanges 51. The top wall may be provided with openings 58 and suitable indicia to indicate the length of wire on the reel. The reel 32 is removably mounted on a head 59 (Fig. 14) carried at the upper end of a rotatable hollow spindle 60. The main body of the head 59 receives the cylindrical wall 55' of the reel 32 and the lower flange of the reel is seated on a projecting flange El at the lower portion of the head 59. The cylindrical wall 56 carries an inwardly directed pin 62 which is adapted to be received by a slot 63 in thehead 59. The head 59 is provided'with a spring pressed ball 6'4 which is arranged. to enter partlyinto an opening 65 in the cylindrical wall 56when the reel is applied to the head with the projection 62 in the slot 63.. The head 59 isprovided with a radial slot 66. within which is pivotally mounted a bell crank lever 61:. One arm of the lever 61 is forked to engage a projection 68 on the upper end of a plunger. 69 located 6 withinthe hollow spindle; 60;, The" lower flange of. the. reel 32 and its cylindrical. wall "56 3.181310.- vi'dedwith a slot. Hi: which is in alignment with the'other arm ofthe lever. 61when.the-':reel:.3.2

is'appliedlto. the head 53 with the. projectionj2 in the slot 33... .Itwill be readily understood from Fig; 14.- that;v when a loadedreel 32* is thusiapplied to the head 53'- the wire onthe reelwill swing' the bell cranklever B1 in counterclockwise direction as viewed in Fig. 14' and that the lever will. con sequently elevate the plunger 69.. When; however almost all the wire has been withdrawnirom the reel 32theweight of the plunger Gil-Will cause theplunger to drop, sincethe bell crank leveris now freeto enter the slot 10." Thisfdescent; of the plunger stops the motor and applies the brakes in manner hereinafter to be described. The 'wire is permanently secured to. the .reel 32 ator near its upper flange so that the stoppage of the machine -wi l-loccur beforeall theconv'olutions ofthe wire arewithdrawn from thereel n, since the-slot m is-loc'ated in the lowerpart of the-reel. I

In order to facilitate handling of the wireI secure to the free end thereof aclip 111471111011 com-prisesan' outer plate 1 2 and inner resilient. contacts 13. 'The contacts 13 arespaced sothat they can enter between the flanges of the: reel 32 and resiliently engage them/the outer plate 12" extending over the peripheriesof the flanges as shown in Fig. 27. On the upper surface of the takeupreel-3 l I provide an opening]! which is adapted it receivethe clip -H inthe same manner as dothe flanges of the reel 32:51pm videa slot orrecess liin the upp rflange of the'wire receiving recess 43 of the takeup' reel 3-|-. Consequently to prepare the-"machine for operation the reel" 3215 applied to' the' h'ead 59f, this head being provided with an upwardly projectinghandle TSsothat the 'head canb'e held stationary in desiredposition during the application of the reel 32'. The clip- H isthengrasped tounreel the free end of the wire which is passed around the head 34'intotherecess1'5. The clip H is then pushed into the opening 'll and the reel 31 may berotated by hand so as to" take up the slack in thewire; The machine may now be started by actuation of thema-nual control 35 into the play or record posi-ti'on. A f-ter-reproduction and rewinding the machine stops'with' a 'few convolutions of'wi're onthereel 3'lv The supply reel 32 may be rotated by the handle 16 so as to take up thesefew convolutions whereupon-the clipl-l is removed from-therecess M andall the wire is taken up by manual manipulation of" the supply reel 32. The clip' H is then applied to the takeupreel-32 in the manner shown in Fig. 2'7 and this reel may now be removed for storage and replacement. The recess "is provided with a nail hole extension 15' to facilitate removal of the clip 1'! from the-reel 31 l I The machine illustrated with a supply reel32 of about two and one-half inches in diameter accommodates seventy-two hundred feet of wire, sufficient, with an average wire speed of two feet per secondQfor playing; for one hour. Of course w thlarger reels the play time may be increased to any'desired extent. The rewind time is approximately one-fifth the play time. In some exceptional cases it may be desired to operate this machine substantially without intervals for rewmding. In this event the reels 3| and32 may be removed and maybe replaced with other reels for resumed playing with only a few seconds delay. The reel 32 may be removed by simply lifting it upwardly. The reel 3| may be removed by unscrewing the disc 48 with the aid of the finger holes 11 whereupon the reel 3| may be lifted up and replaced. The removed reel 3| may be rewound on a rewind machine or the two removed reels 3| and 32 may be stored for rewinding at a later time. To facilitate such storage I provide in the central dished portion of the reel 3| two clips 18 which engage the lower flange of the reel 32 which is applied to the upper portion of the hub 45, as shown in Fig. 25. The end of the wire which is permanently attached to the reel 32 is passed through the notch 15 in the manner shown in Figs. 26 and 28, this notch being of crisscross formation as shown in Fig. 28 so as to avoid kinking the wire.

The machine is driven by a motor 18 (Fig. mounted in the lower part of the machine with its axis vertical. Its spindle carries a wheel 88 located below the base 38 and a small drive wheel II which projects through the base so as to be engaged by the rubber tired wheel 44 which also engages the skirt 42 of the reel 3| when that reel Is being driven. When the reel 3| is not being driven the rubber tired wheel 44 is maintained out of engagement with both the wheel 8| and the skirt of the reel 3| as shown in Fig. '7. A retractable rubber tired wheel 82 is arranged to engage the wheel 88 and a wheel 83 which is rigidly mounted on the shaft 58, during rewind as shown in Fig. 7. During play or recording the rubber tired wheel 82 is out of engagement with the wheels 88 and 83 as shownin Fig. 3.

I The head 34 is rigidly mounted on a shaft 84 (Fig. 30) and has depending therefrom a rod 85 which extends downwardly through an opening in the base 38 to prevent the head from turning. The shaft 84 is provided with an endless double thread 86 which is engaged by a detent 81 on a cylindrical block 88. The block 88 is rotatably mounted in a cylindrical opening 88 on a sleeve 88 which is rotatably mounted on the shaft 84. The sleeve 88 is held against longitudinal movement and it includes a. pulley wheel 8| whereby it may be driven. When the sleeve 88 is driven the detent 81 following the endless thread 88 moves the shaft 84 and head 34 up and down continuously, its displacement being equal to the depth of the wire receiving spaces in the reels 3| and 82. The arrangement is suchthat the slot or groove 38 moves between the upper and lower levels of the wire receiving spaces of both reels. The pulley 8| is driven by a belt 82 from a. pulley 83 which is integral with a larger pulley 84 (Fig. 10). The pulley 84 is driven by a belt 95 from the pulley 52 on the shaft 48 which supports the reel 3|. It is to be noted that this reel is driven during play and recording butduring rewind it is also driven by the wire which is being taken up by the supply reel 32. Consequently during both wind and rewind the head 34 is oscillated upwardly and downwardly to serve as a level wind for the reel receiving the wire. The pitch of the screw 88 is arranged to place the wire convolutions quite'closely on the smaller reel 32 and consequently the convolutions applied to the reel 3| are spaced further apart. If desired the drive of the pinion 8| may be varied between the wind andrewind positions so that the same close winding may be attained on both the reels 3| and 32.

The manual control 35 is a lever having an indicating point which cooperates with indicia on the base 38 to indicate the wind, off and rewind" positions. The control 35 is moved from one position to the next through 90. The control 35 is rigidly mounted on a hollow shaft 86 (Figs. 20 and 21) which rigidly carries four cams 81, 88, 98 and I88 and at its lower end the shaft 98 rigidly carries a crank |8|. Two springs I82 are connected to the crank |8| so as to bias it towards the intermediate or oil position. When the manual control 35 is moved to wind or rewind position the springs I82 are tensioned. The rewind position of the crank |8| is shown in Fig. 12. In the wind position the crank occupies an opposite radial position.

The cam I88 controls the switch I83 which energizes the motor. In the oil position the switch is open. In the wind position (Fig. 6) and in the rewind position (Fig. 11) the switch is closed. When the control 35 is moved to wind position a detent on a lever I84 enters a recess I85 in the cam I88 and holds the control 35 and shaft 88 in this position as shown in Fig. 6 until the lever I84 is actuated whereupon the control 35 and the cams on the shaft 86 return to the oif position, the cam I88 permitting the switch I83 to open. Likewise when the control 35 is moved to rewind position, a detent on a lever I88 enters the recess I 85 and maintains the shaft 86 and associated elements in the rewind position until the lever I86 is actuated. The levers I84 and I88 are biased towards the cam I88 by a common spring I86.

The cam 81 controls the rubber tired wheel 44. This wheel is rotatably mounted in a yoke I81 which is pivotally connected to a link I88. This link is pivotally mounted on the upper side of the base 38. A spring I88 connected to the yoke I81 biasses the wheel 44 into engagement with the drive wheel 8| and the skirt 42 of the reel 3 I. A projection ||8 (Fig. 2) extends downwardly from the yoke I81 through a relatively large opening in the base 38 and is received in a. relatively large opening III in a link II2 slidably mounted on the under side of the base 38. The free end of the link II2 is forked as shown in Fig. 3 and is guided and supported by a stud 3 depending from the base 38 (Fig. 3). The other end of the link II2 is pivotally connected to one arm of a bell crank lever II4 which engages the cam 81. When the control 35 is in the wind position the bell crank lever II4 engages a low part of the cam 81 under the action of a spring H5 and the spring I08 brings the wheel 44 into engagement with the drive wheel BI and the skirt of the reel 3|. The opening III is sufliciently large that the link II2 is out of engagement with the projection I|8 during winding operation. When the control 35 is moved to the oil" and rewind positions the bell crank lever II4 is engaged, by high parts of the cam 81 so that the wheel 44 is moved out of contact with the drive wheel 8| and the skirt 42 of the reel 3 I.

The cam 88 controls in similar manner the rubber tired wheel 82 which engages the drive wheel 88 and the wheel 83 during rewind. The wheel 82 is rotatably mounted in a yoke H8 which is pivotally connected to a pivotally mounted arm II1. A spring II8 biasses the wheel 82 into engagement with the wheels 88 and 83. A projection II8 on the yoke 8 projects upwardly through a large opening I28 in a link I2| which is slidably supported at its free end in the same manner as the link II2. The other end of the link |2| is pivotally connected to a lever I22 which is biassed by a spring I23 into engagement with the cam 88. When the control 35 is In Fig. 7. When the control 35 isxnoyed to the off position or to the wind position the lever I2; engages a high part of the cam 3'; and the link I21 forces the wheelBll out of engagement with the wheels 80 and 83. The off position of these elements is shown in Fig; 16.

The cam 99 controls -the brakes L24; i215 and I26 which are l ers rr insisuitshl brakin material arranged to engage the wheel 80; the" outer surface of the skirt'l42 oi the reel 3! and the wheel 83 respectively, The endszof the brake levers remote from the brakingjele nentsare' biased against the peripheryvofthe- 9e by suitable springs as shown infFlg. 5 so. that these springs tend to apply the brakes. The earn 99' is substantially oval in shape. when the cam 99 is in wind position the "brake levers engage a high part of the cam 9'9. as'shown. in Fig.5 so that the brakes areheld out of, operation. The same is true when the cam 391s in rewind position, as shown in Fig; 10'; When. the cam 99 is, in the off position as shown in Flglfitjhe brakes are applied since 'a low part oi the cam 99. is opposite the brake levers; 7 is applied by the s ring I111.- The brake [25 and I26 are applied by springs I23 and] I25: respectively. At the end of rewlliding itis preferred to increase the braking effect on thelarge'reel so a to a n the i e iai .Likew se t the end of. the. winding" operation it is preferred to increase the braking eifect on thereof 37; so a t k p h re tau b' thcas s t" d?- I b ke f?! 10 lever I30 increases the tension onv the spring I28 so that an increased braking effect is applied to the drum 3I' at theend or the rewind operation. The lever I30 maintains that position until the manual control 35 is subsequently moved to the wind position. As the control 35 ap-' proaches the wind position the pin I38 engagesthe inwardly extending arm of thelever I33 so that this lever is swung to'disengage its shoulder from 'the lower projection I31 as viewed in Figs. 5 and 10; The final movement or the control 35 into wind position carries the lever, I33 in the clockwise direction as viewed in these figures un-- til' the shoulder I35 of the lever I32 engages the upper projection I36 as viewed in Fig. 5. Consequently' in the wind position the lever I30 has sirable to brake more effectively: the delivering reel. For this purpose thesprings I10 and I2! are connected to one end of a. movable lever I which is pivotally mounted on the shaft 96 below the cam 99. The other end of the'lever I30 pro jects through an opening in. the vertjibalwall of a stationary bracket I'3'I' as best seen in Figs, 5 and 10. At its extremity the lever I30 pivotally carries'two three armedllevers I32 and. I33. .O'ne arm of each lever projectscntwardly and these two arms areconnected by a spring I341 Another arm. of each leveris provided" with a shoulder I35. The wall I3I' carries two projections I and. I3! which, are adaptedito be-engaged by the shoulders I35. The. third armof each-lever I32. .and I33 extends inwardly through. the opening in the wall I3 I in the general direction or. the lever I30- The. spring. I34 biasses the arms carrying the shoulders I35 towards the w n I3I and. biasses thein'wardly. directed arms into position beyond the sides ofthe adiaefintportion ofthe lever I30. Depending from the earn 9'! are two pins I38 and I39 which cooperate with the inwardly directed arms-of the levers- I33. and I32 and. with therighthandl portion of the-lever. I310- as viewed. in Figs. Sand. 10. Theseipins miss. the leithand side, of the lever I30 since thatporr tion of the lever is dis'pl'aeed. downwardly out-of their path. When the contr'ol.35Tis'1novedto. re.- wind position (Fig. 10). the pin [39 engagesithe inwardly directed arm oi the lever. I32 raising it out of engagement with the associatedprojertion 36. The. finalmovementofthe control member 35 into rewind position carries. the lever I30 upwardly and permits theshoulder. [35' of the lever I33 '00- engage-the lower. projection. I31 as viewedin- F-igFIOLQ 'displaeement ofthe.

been displaced so as to increase the tension on the spring I29 thus increasing the braking effect on the reel 32 when the brakes are applied at the end or the wind operation. This condition of the lever I30 continues until the control 35 is again moved to the rewind position. The lever" I30 remains in its position in Fig. 15 at the end of the wind operation and it remains in its position of Fig. 13 after the end. of the rewind operation; 7

The actuating members 55 carried by the reel 3| cooperate with a lever I40 which is pivotally' mounted by means of a shaft I4Ifi on a bracket I42- carried. by the liaise 3ll below' the reel 3|. A spring I43 mounted on the shaft?! to engage the bracket I42 and a collar on the shaft I4I biasses the lever I40 into its position in Fig. 1 in. which it registers with theactuating members 55 when the pl'ungers 513 are held in by wire on thereel' 3I'.v The level. I40 has a downwardly extending. arm (Fig; 17) which is connected by a link n tolever' 1 at (Fig. 11);. The inner" end of the shaft [I41 is engage b the armature 145 of an electromagnet I46. When this electromagnet is energized its armature diSplace's the shaft I4I so. as to'bring' the lever I40 into register with the'path of the: actuating: members 55' whenthe' plungers 53' are freed tomove radially outwardly on the drum 3! as a result of: the removal or. wirefromthat drum; The pivot I41 which connects the lever I40 to the link I44 is extended as shown in Fig; 24 so as tocoop'era'te with the: switches I48, I49" and I50. During the wind operation the detent of the lever I05 en! gages a high part of the cam. I00 (Fig 6' so that. the lever' m1 is held down out of tnepath or the actuating members 55 as'sho'wn m Fig; 1'7. The switch I143 is held open so that the electromagnet I is deenergized; the switch 3' is held closed and. the switch I is" open} The switches I49" and- I50 ma Suitably "serve as. muting rewinding. switch- |'.49 may suitably be in the. B 'supply .ot' the amplifier and the. switch I50 may he shunted across the voice soil of the speaker. p

' During rewind the delight of! the lever. I06 enters the reice'ss I05 in a low part? of the" cam- I00 (Fig. in. and thelink in is r'novedto theswitchestopreventreproduction of sound during? the lever I40 so that the detent of the lever I06 is withdrawn from the recess I05 in the cam I whereupon the control 35 moves to the oiT position and the machine is stopped in the manner previously described. In the event that the power supply is interrupted during the wind operation, the higher inertia of the reel 3| keeps the wire taut as the machine coasts to a stop. If the power supply is interrupted during the rewind operation the higher inertia. of the reel 3I would cause this reel to feed out a certain length of wire which would not be taken up by the supply reel 32. This machine takes care of that possibility since interruption of the power supply to the motor deenergizes the electromagnet I46 and allows the lever I40 to move inwardly into the path of the actuating members 55 which are held inwardly by the wire on the reel 3|. Consequently the lever I40 is actuated to withdraw the detent of the lever I06 from the recess I in the cam I00 so that the shaft 66 moves to the oif position applying the brakes to the machine. Since this occurs during rewind operation the lever I applies stronger braking pressure to the reel 3I so that the wire is maintained taut between the two reels 3| and 32. In order to reduce the inertia of the large reel 3I it is preferred to make this reel of aluminum, plastic or other light material but ordinarily its inertia is much greater than that of the reel 32.

The stop button 36 is mounted on the control as shown in Figs. 20 and 21. This button is rigidly mounted on a rod I5I which is slidably mounted in the hollow shaft 95. The rod I5I and the button 36 are biassed upwardly by a coil spring I52. A plunger I53 is mounted for limited movement in a radial bore in the cam I00 which opens into the recess I05 in this cam. When the detent of either lever I 04 or I06 is located in the recess I 05, that is during wind or rewind the inner end of the plunger is projected into the bore of the shaft 96 as shown in Fig. 20. The lower end of the rod I5I is pointed so that downward actuation of the button 36 cams the plunger I53 radially outwardly so that the detent of the lever I04 or I06 as the case may be is moved out of recess I05 so that the hollow shaft 96 and the control 35 are free to move to the off position. In Fig. 21 the plunger I53 has just displaced the detent of the lever I04 from the recess I05 and the shaft 06 is now free to move to oif position. Actuation of the button 36 promptly stops the machine and applies the brakes in such manner that the wire is maintained taut.

The plunger 69 is provided with a radially directed pin I54 which projects outwardly through a slot I55 in the hollow spindle 60 which carries the supply reel 32 (Fig. 14). The pin I54 is arranged to cooperate with the upturned flange I56 on the lever I04. When the plunger 66 is in its elevated position owing to engagement of wire on the reel 32 with the lever 61 the pin I54 rotating with the spindle 60 misses the flange I56. When however the wire is almost depleted from the reel 32 the plunger 69 is free to move downwardly so that the pin I54 engages the flange I56 and withdraws the detent of the lever I04 from the recess I05 of the cam I 00. The shaft 96 and the control 35 now move to the off position stopping the motor and applying the brakes. It is to be noted that when the control 35 is in the off position the cams 91 and 98 maintain the rubber tired wheels 44 and 82 out of engagement with the wheels with which they cooperate. Consequently when the machine is 12 V out of operation for prolonged periods of time there is no risk of the rubber tires of these wheels being deformed.

It is preferred to provide onthe base 30 walls or formations I51 and I58 which substantially surround the reels 3I and 32 when they are mounted on the machine. These walls are provided with openings I59 and IE0 to permit the wire to pass from reel to reel. They are also provided with opposed openings I6I and I62 respectively which enables the operator to engage the reels at opposite sides during removal or application. The base 30 is also provided with a housing I63 to accommodate the brake I25 which cooperates with the reel 3|.

In addition to the brakes I25 and I26 I preferto provide additional brakes for the reels CH and 32 which apply constant resistance to movement of the reels. Consequently during wind and rewind the delivering reel is always opposed to some extent so that the wire is maintained taut. The brake for the spindle 60 which carries the reel 32 may suitably be in the form of a spring I64 (Fig. 22) which is carried by a bracket I65 and is resiliently forced against a small brake drum I66 carried by the spindle 60. The pressure of the spring I64 on the spindle 60 may be adjusted by means of a screw I61 carried by the bracket I65. A similar spring I68 carried by a bracket I69 is pressed against a small brake drum I10 carried by the shaft 46. The pressure exerted by the spring I68 on the shaft 45 can be adjusted by means of a screw HI.

I also prefer to provide a snubber I12 (Fig. 30) which exerts a certain pressure on the wire between the supply reel 32 and the head 34. This snubber may be in the form of a suitable contact which engages the wire and is carried by a spring I 13 mounted on the upper side of the head 34. The tension of the spring I13 is sufiicient to bend the wire slightly. In case of minor frictional resistance on the wire coming off the reel 32 the snubber I12 yields so that the wire moves through the head 34 at substantially uniform speed.

I provide on the bas 30 around the head 34 an upstanding flange I 14. The head 34 comprises a lower portion I15 which is slightly spaced from the flange or housing I14 and is sufliciently deep so that it does not elevate substantially above the upper edge of the flange I14 during the oscillation of the head. The flange I14 serves as a guard preventing the user from locating his fingers below the head where they might be injured by the downward movement of the head.

In the wall I51 which is located around the reel 3I I provide a recess I16 (Fig. 8) which registers with the wire receiving peripheral recess 43. In case one or more turns of the wire on the drum 3I become loose they expand into the recess I16 and are prevented from working into the space between the skirt of the drum 3| and the wall I51. Consider the lowermost convolution of wire on the drum 3I which may be freed of tension. The circle of wire tends to increase in diameter and one portion of it is projected over the space between the skirt of the drum 3I and the lower portion of the wall I51. Continued expansion of this convolution of wire projects a portion of the circle across the gap and into the recess I16 so that now two portions of the wire bridge the gap and the convolution may grow until it is supported on the lower edge of the recess I16 which registers with the ledge at the lower side of the recess 43; When the wire 'isagain made taut it-is transferred 'back mo the recess 43 without any risk'oi :w-irerzdroppin :into the gap; r i

I prefer to provide the motorIl-wi'th-asubstantial fly-Wheel [T1 (Fimlfl) to" promote stability'of wire speed. Preferably 'the inertia of the-fiywheel is suflicientiy great so that the inertia "of the rotating 'elements -associated with the-receiving -reel' is--always:greater than the inertia of the supplying reel. J.In -*this=case the shaft al-l'l may be -non-slidably= mounted shown in Fig; 36 a'nd the relay 46 and-switchl' may be omitted so" that the motor is stopped :during rewind b'y actuation of the Ml onlyswhen one of the plungersfl -moved radially outwardiv asa "result"'of' dep1etion'; oi theatre I 1rom-*the drum 3i. In 'this' case ir'e'thrpower supply. tails during "rewind the inertiao! the fiy wheel [11, motor ll,-'-the reel ll anduassociated-rparts is greater than the inertiahi-the reel-'81 vso that-the wire remains taut as: the mechanism :coasts. to a stop. Resumption of the power-supply :puts the machine into operation tagain. 1 Likewise if the power is interrupted during play ':or recording the inertia of the drum dl; the motor 19.. and the one end orthe lever m the wei ht .isz is mounted on x the other. sidetoi fliespimt of the lever 1-81. Here againtthe 102 rare-of such magnitude and.- location that, the znluneers 53 are balanced centriiugally and. they r-arte biassed outwardly-at all timesaonly by the iconstant force providedby thespringsik,

In the embodiment pivoted levers are dispensed :with. The extensions 1-80 extend beyond the axis and. art-thev inner ends weights "3, The :extensions-maysuitably be guided in brackets 'i'8lsdependinzwfrom the under sidewof theereelsll. :The magnitude and rlocationrorithe weights? 1:81 arranged so that each plunger 51-215 ibalanoedacentrifugally and these plungersuare biased outwardly atoll times only by I the; provided --.by the springs 54. i a e I I It: is important that the 'elements 5.1; and 25 be biassed outwardly at.- all Thus i the machine is stopped automaticallyqby. the .ont-

' ward proj ection ofn plunger 'Hatithe :end or the fly wheel lIT'is grea-ter than'ithesinertia softhe v reel 32 and-associated parts :so that the wire is maintained taut :as the machine coas'ts te -a.

sijgp v. r H

' In-the previously described-embodiments ithe eler'nents-v '81" and 1. $3-:which 1 engagethe wire are unbalanced eentrifngally. f'i heser elements are normallyi made' as iliglittas z zzossible but rinzsome easesthe centrifugal unbalanoemay Ebe. objectionable. some cases -they may :rdistort the wire out =01 round so that variations :are :introcrank 'leverindependent: mt: :centfliugal :iorce.

The only lforcetending tofmovemhersouter: end or thebell zeranksleveninto. the-wire "snacem that provided:ihyitheepltmger ia; Whichzmawsuitahly be-atstout wire hentzat dtsi'zlomer end touprovide the projecting: apirr til. I the weight ofithe plunger 69 issuflicient'tmprovide :the slight outward bias' to the bell 'crank -lever:6.'| izbutin lease it desired to increase this a :spring I 1.9 may be locatedwithin thedaandlea'li.

In Fig. 33 I have shown a modification imwhich the -plungers L53 Lore .tbalanced': centriiugally and "are; messed outwardly... ,by'lther: constant slight v.ioree:provided" brthetsprings-gril. The :plunsers -63 anemrovided; with extensions-1l aflwwhich=extend-past me ax sarxd meip lysconnected to intermediate positions of "levers 48l which are pivotally mounted -on-.the under side i of the reel :3 IV. .'Ihe levers m are iprovided at their free ends withlweig hts 182. v ..These weights are of such magnitude and locatiomthat ;the .nl11ngers Stare balanced centnm anysd that thejplungers "53" are biassed' outwardly only by the :force' provided'by the springsldat'all times.

",In the embodiment of Fig. 34ith'e levers 18'! are "pivotally mounted at intermediate po'ints on the under side-of the r'eeldl *on the some si'deoi rewind-operation, the operator may accidentally move thecontrol lever back .z-to rewind position. -If oentrifugalxforce were relied npomtoproject the 'plungers ia, the wire -=wou1d probably; be

crease of the Reflective diameterroi'the takeupreel. The :same: build up'incream the cloud on the motor tending to reduce: the :speedoi "the motor; "By my. combinationwrot, a, smallsuhply reel, :a largextakeup (reel. and casmotoroi suitable torque-load characteristics 1 omlena'bled tubalance these two 'tendencieszand provide aimachine imwhichLthe wire speed is-substantialiyuniform throughoutlthe-windingoperatiom .Although my invention :haseheenidescribed, :in connection with .thenspecific detailszof 13. 529138- ierred embodiment :thereof, 7 Bit" must Y be h :understood that such details :are :not dntended zto. be limitative of the invention except-in so ,,ar.,, as set forthinthe acoompanyingrclaimsi" V c Having thus described my inventionfi deciare thatwhatIclaimis: i

1 In a-machinelor handling magneticrecord ring medium; in combination; a pair .of reels,

1 means rotatably mounting said reels, a-motor the 'axis "as the plungers il' to a Whicl'r they ar e w connectedfi Each-extension [8815 connected to L operatively connected to I one reel todrive it for the transfer-of medium to it irom the other=ree1, a pair of elements each biased outwardlyinto engagement with-themedium-on said other=-reel,

said elements being spaced inthe-exial direction of said other reel, wherebyseveral-eonvolutions oi medium are normally located: therebetween, and means arrangedtoeooperatewith either'element to stop the motor when either element is disengaged I)y-' tl'ie medium and is freed to move t ld ly vflff 1- 1 a 2. In machine' forhandling' magnetic-recording medium, in combination, "a pair of reels, means rotatably mounting said reels, means operatively connected to one reel to drive it for the transfer of medium to it from the other reel, a brake arranged to apply braking force to said other reel, a pair ofelements each biased outwardly into engagement with the medium on said other reel, said elements being spaced in the axial direction of said other reel, whereby several convolutions of medium are normally located therebetween, and means arranged to cooperate with either element to apply said brake and terminate the Operation of said drive means when either element is disengaged by the medium and is freed to move outwardly.

3. In a machine for handling magnetic recording medium, in combination, a pair of reels, means rotatably mounting said reels, a motor, drive means operatively connecting said motor to one of said reels to drive it for the transfer of medium to it from theother reel, a pair of elements each biased outwardly into engagement with the medium on said other reel, said elements being spaced in the axial direction of said other reel, whereby several convolutions of medium are normally located therebetween, and means arranged to cooperate with either element for disconnecting said drive means from the driven reel when either elementis freed to move outwardly by depletion of medium on'said other reel.

4. In a machine for handling magnetic recording medium, in combination, a pair of reels, means rotatably mounting said areels, means driving one of said reels for the transfer of medium to it from the other reel, a member associated with said other reel, means centrifugally balancing said member, means applying aconstant bias to said member to bias it outwardly against the medium on said other reel, and means controlled by the outward movement of said member when it is freed by depletion of the medium from said other reel, to' terminate the drive of the driven reel.

5. A machine for handlingmagnetic recording medium, a pair of'reels, means rotatably mounting said reels, meansdriving one of said reels for the transfer of medium to it from the other reel, a pair of elements associated with said otherreel, means centrifugally balancing each of said elements. means applying a constant bias to each of said elements to bias each of them outwardly against the medium on said other reel. said elements being spaced in the axial direction of said other reel whereby several convolutions oi. medium are normally located therebetween, and means actuated by either element when. it is free to move outwardly by depletion of medium on said other reel for terminating the drive of the driven reel. Y

6. In a wind and rewind machine for magnetic recording medium, in combination, a supply reel, a takeup reel, an operable brake for each reel, a motor, means for operatively connecting said motor to either reel forwind or rewind of the medium, means for relatively increasing the braking effect of the brake associated with the delivering reel, and means for applying said brakes and terminating the drive of the receiving reel by said motor. v

'7. In a wind and rewind machine for magnetic recording medium, in combination, a supply reel, a takeup reel, an operable brake for each reel, a motor, means for operatively connecting said motor to either reel for wind or rewind of the .medium, means for relatively increasing the braking eiiectof the brake associated with the.

delivering reel, a manually actuable control member arranged selectively to connect the motor to a selected reel, to'c1ose the switch and condition the brakes relatively to increase the braking effect of the brake associated with the unconnected reel, and means vfor actuating said control member to eifect the opening of the switch and the application of the brakes.

9. In a wind and rewind machine for magnetic recording medium, in combination, a supply reel, '21. takeup reel, an operable brake for each reel, a motor, a switch for said motor, means Ior operatively connecting said motor to either reel for wind or rewind of the medium, means associated with last said means for relatively increasing the braking effect of the brake associated with the delivering reel, a manually actuable control member arranged selectively to connect the motor to a selected reel, to close the switch and condition the brakes relatively to increase the braking efiect of the brake associated with the unconnected reel, and means for actuating said control-member to eifect the opening oi. the switch, the disconnectionof the connected reel from the motor, and the application 01 the brakes. 3

10. In a wind and rewind machine for magnetic recording medium, in combination, a supply reel, a takeup reel, an operable brake for each reel, a motor,.a switch for said motor, means for operatively connecting saidmotor to either reel 4 for'wind or rewind of the'medium, means associated with last said means for relatively increasing the braking efiect or the brake associated withthe delivering reel, a manually actuable co trol member arranged selectively to connect the motor to a selected reel, to close the switch and condition the brakes relatively to increase-the braking effect of the brake associated with the unconnected reel, and means controlled by the depletion of the medium from the delivering reel for actuatingsaid control member to eiIect the opening of the switch and the application of the brakes.

11. In a" wind and rewind machine for ma netic recording medium, in combination, a supply reel, a takeup reel, an operable brake for each reel, a motor, a switch for said motor, means for operatively' c'onnecting said motor to either reel for wind or rewind of the medium, means associated with last said'means for relatively increas ing the braking effect of the brake associated with the delivering reel, a manually actuable control member arranged selectively to connect the motor to a selected reel, to close the switch and condition the brakes relatively to increase the braking effector the brake associated with the unconnected. reel, and means controlled by the depletion of the medium from the delivering reel for actuating said-control member to efiect the opening oi the switch, the disconnection of the connected reel iromthcmotor,,andtbe anpll cation oi the brakes,

12, In a wind and rewind'machinc for handllng magnetic recording medium, in combination, a pair of reels, a motor a switch for the motor, a pair of means for connectingeach of said reels to said'motonmeans applying a slight braking forceto each reel, a pair of brakes ior applying braking forceto each reel, a single control member. biased to a.r orma1 position in which it opens saidswitch and controls the disconnection oi. both connec in means fromthe reels and the motor. and the applicationof said brakes, saidcontrol member. being movable to a second position in whichit closes said switchand controls the connection of oneor said connecting meansto one reel and the motor andthe location of said brakes in-nnapplied condition, saidcontrol member-being movable into a third position in which it, closes said switchand controls the connection of, the other connectin v means, to the other reel and motor and, the locationfof the brakes in unapplied condition. latch meanfsre taining said control memberin the second and third positions, and means on thedelivering reel for disengaging said latch. means esthe medium approaches depletion therefrom, to permit the control member to move into its. first mentioned position. 1

13. Ina. wind'and-rewindjmachine for han-- dling magnetic recording medium, in combination, a pair of reels, a motor, a switch for. the motor, apair of meansfor connecting each of. said reels'to said motor, means applyinga slight brakingiorce to-each reel,..al' pair ofv brakes for applying; braking force to. eachreel, a single con trol member biased to anormal posi ion in whichv it opens said switch and controls the disconnection of both connecting means from the reels and the motor andthe applicationof said brakes, said control member being movable to .a second position in which it closes said switch and controls the connection of one of said connecting means to one reel and the motor and the location of said brakes in unapplied condition, said control member being movable into a third posit on in which it closes said switch andcontrols the connection of the. other connecti'ngmeans to the other reel and motor and the location-oi the brakesin unapplied condition, latch means retaining said control member .in-the second and third positions, manually operablemeans-for disengaging said latch means and means on t-hedelivering reel for disengaging said latch means as the medium approaches de letion therefrom, to permit the control member to. move into lts'fi-rst mcntioned position. I

14, In a wind and rewind machine for handling magnetic recordingmedium, in combination, a pair of reels, a motor, a switch for the motor, a pair of means for connecting each of said reels to said motor, means applying aslight braking force to each reel, ,a pairof brakes for applying braking force to each reel, a brake for applying braking force on said'motor, 'a single control member biased to a normal position in which it'opcns said switch andcontrols the dis.- connection of both connecting means from the reels and the motor and the application of said brakes, said control member being movable'to a second position in which it closes. said switch and controls the connection of one 01 said connecting means to one reel and the motor and the location of said brakes in unapplied condition, said control member being movable into a third position in which itcloses said; switch and controls the c nnection of the othcrconnectinc means to th other reel and :motor-andthe location of the brakes in unappli'cd condition, lat h means. r tamingsaid control member in the second-and third positions; a d. means for. releasing said latch means to permitthe control member to move into. its first mentioned position. I I

15. .In a .wind'and. rewind machine for handling magnetic recording medium. in'combination, a 1

pair of reels. a motor, aswitch'for the motor, a

pairormeans for connecting each of said reels to said-motor, meansap lymg; a slight brakin force to each re l,,.a pair of brakesioriapplying braking iorceto. ea h reel. a brake torenp n braking force. on said motor, a single control member biased tea-normal position in which it opens, said switch and controls the, disconnection of bcthconnectin means from. the reels and the motor'and the applicationiof saidbrakes sai control member. belnsmovable c) a secon po tion in which .itolos'essald switch and controls the connection or'o'ne or said connecting means to one reel; and, the. m tor and the. location r said brakes'in unapplied condition, said control member being movable into a third position'in which it closes saldswltch and controls the connection of the other connecting means to the other reel and. motor and the location of the brakes in unapplied. condition. latch means rc taining, said .controlmember in the se ond and thirdp n fand means on the de erin reel for disengagingsaidlatch means as the medium approaches depletion. therefrom. to p rmit the control member to. move into its first mentioned position.. r j H I 16. In .a wind and rewind machine for handling magnetic recording medium, in combination. a pairof reels, a motor, arswitchv for the motor, a

pair oimeans for connectingeach of said reels the connectionof one of said. connecting means to one reelfandithe mo or :and the location-'01 said brakes .in. .unapplied condition, said control member being movabl into a. thirdposit on in Whichv it closes saidswitch andcontrolsthe con motion of, the. other c nnecting rmeans to the other reel and motor and he location ofthe brakes inunapplied condition, latchmeans rc-' taming said control m mberin the-second and thirdipositions, manuall operable means for disengaging .saidlatch. means and means on .-the delivering reel .for di ensasing sald latch-means as themedinm ap roaches depletion-therefrom, ih crmit the control member tomove into its first mentioned position;

In .a windy andrewind machineffor hen (hing-magnetic recording medium, incombine..- t1on..a pairoi reels, a motor; a switch .forthe motoif a pair of meansior connectingeach of said. reels to said motor, means applying a. slight braking fierce to each reel, pair of brakes forv m lyingw raking, ions to each'rcel, asinsle ontrol member biased to a normal position in Whichit openssaid switch and controls the dis connection of both connecting means from the reels and the motor and the application of said brakes, said control member being movable to a second position in which ,it' closes said switch and controls the connection-of one of said connecting means to one reel and the motor and the location of saidbrakes in unapplied condition, said control member being movable into a third position in which it closes said switch and controls the connection of the other connecting means to the other reel and motor and the location 'of the brakes in unapplied condition, latch means retaining said control member in the second and third positions, means for relea-sing said latch means to permit the control member to move into its first mentioned position and means actuated by the movement of the control member into its second and third positions for conditioning the brakes tor the reels relatively sothat a stronger braking force is applied to the unconnected reel.

18. In a wind and rewind machine for handling magnetic recording medium, in combination, a pair of reels,a motor, a. switch for the motor, a pair of means for connecting each of said reels to said motor, means applying a slight braking force to each reel, a pair of brakes for applying braking force to each reel, a brake for applying braking force on said motor, a single control member biased to a normal position in which it opens said switch and controls thedisconnection of both connecting means from the reels and the motor and the application of said brakes, said control member being movable to a second position in which it closes said switch and controls the connection of one of said connecting means to one reel and the motor and the location of said brakes in unapplied condition, said control member being movable into a third position in which it closes said switch and controls the connection of the other connecting means to the other reel and motor and the location of the brakes in unapplied condition, latch means retaining said control member in the second and third positions, means on the delivering reel for disengaging said latch means as the medium approaches depletion therefrom, to permit the control member to move into its first mentioned position, and means actuated by the movement of the control member into its second and third positions for conditioning the brakes for the reels relatively so that a stronger braking force is applied to the unconnected reel.

19. In a wind and rewind machine for handling magnetic recording medium, in combination. a pair of reels, a-motor, a switch for the motor, a pair of means for connecting each of said reels to said motor, means applying a slight braking force to each reel, a pair of brakes for applying braking force to each reel, a single control member biased to a normal position in which it opens said switch and controls the disconnection of both connecting means from the reels and the'motor and the application or said brakes, said control member being movable to a second position in which it closes said switch and controls the connection of one of said connecting means to one reel and the motor and the the location of said brakes in unapplied condition, said control member being movable into a third position in which it closes said switch and controls the connection of the other connecting means to the other reel and motor and the location of the brakes in unapplied condition, latch means retaining said control member in the 20 second and third positions, and electromagnetic means electrically associated with the motor for releasing said latch means when the power fails to permit the control member to move into its first mentioned position.

20. In a wind and rewind machine for handling magnetic recording medium, in combination, a pair of reels, a motor, a switch for the motor, a pair of means for connecting each of said reels to said motor, means applying a slight braking force to each reel, a pair or brakes for applying braking force to each reel, a brake for applying braking force on said motor, a. single control member biased to a normal position in which it opens said switch and controls the disconnection of both connecting means from the reels and the motor and the application of said brakes, said control member being movable to a secondposition in which it closes said switch and controls the connection of one of said connecting means to one reel and the motor and the location of said brakes in unapplied condition, said control member being movable into a third position in which it closes said switch and controls the connection of the other connecting means to the other reel and motor and the location of the brakes in unapplied condition, latch means retaining said control member in the second and third positions, manually operable means for disengaging said latch means, means on the delivering reel for disengaging said latch means as the medium approaches depletion therefrom, to permit the control member to move' into its first mentioned position, means actuated by the control member when moved to its second and third positions for relatively increasing the braking efiect or the brake associated with the unconnected reel, and electromagneticmeans electrically associated with said motor for releasing said latch means when the power fails.

HUGH H. DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 789,336 Poulsen et a1. May 9, 1905 947,148 Browne Jan. 18, 1910 947,344 Nicholson Jan. 25, 1910 1,124,879 Edmond et a1 Jan. 12, 1915 1,343,910 Evans June 22, 1920 1,374,335 Sundh Apr. 12, 1921 1,552,552 Gauriat Sept. 8, 1925 1,560,721 OReilly Nov. 10, 1925 1,847,945 Hoskins et a1 Mar. 1, 1932 1,939,181 McCash et al Dec. 12, 1933 2,119,943 Marks June 7, 1938 2,124,938 Wittel July 26, 1938 2,207,075 Sperry July 9, 1940 2,227,303 Flaws, Jr. Dec. 31, 1940 2,266,755 Herzig Dec. 23, 1941 2,298,339" Boes Oct. 13, 1942 2,304,913 Herzig Dec. 15, 1942 2,349,018 Tasker May 16, 1944 2,359,612 Bol'se'y Oct. 3, 1944 2,420,671 Little May 20, 1947 2,438,222 Lear Mar. 22, 1948 FOREIGN PATENTS Number Country Date 852,767 France Nov. 9, 1939 

